Pump



G. J. SPOHRER PUMP Filed July 9, 1919 3 Sheets-Sheet 1 INVENTOR W G BY P W MW 9* M ATTORNEYS Sept 2, 19240 G. J. SPOHRER PUMP Filed July 9, 1919 3 Sheets-Sheet Z z% mgu/lvINVENTOR +4141 ATTORNEYS Sept 2, 192% 1,506,786

G. J. SPOHRER PUMP Filed July 9, 1919 3 Sheets-Sheet 5 Patented Sept. 2, 1924.

UNITED STATES 1,506,786 PATENT OFFICE.

GREGORY JOHN aroma, 01 EAST ORANGE, NEW 3mm.

PUIP.

Application filed J'uly 9, 1819 Serial Io. 808,587.

.such as are employed in inflating pneumatic tires or maintaining a supply of air under pressure for this purpose.

Such a pump, to permit successful and continued operation, should be relatively simple in construction, with its working parts enclosed to exclude dirt. The valves should be of an inexpensive, easily operable and readily accessible type. Preferably a long stroke piston of comparatively small cross sectional area is employed.

Among the objects of the present inven-' tion is thepIOV'lSlOIl of a compact pump, having the desirable characteristics above enumerated and which is operable at maximum efiiciency and without attention.

' Further objects and advantages of the invention will be apparent as it is better understood by reference to the following specification when read in connection with t e accompanying drawing, in which,-

Fig. 1 is a vertical longitudinal section through the pump; Fig. 2 is a vertical transverse section through the pump;

Fig. 3 is an enlarged plan view of the outlet valve;

Fig. 4 is a section on the line 4-4 of Fig. 1; I I

Fig. 5 is a vertical, longitudinal section through another form of my invention; and Fig. 6 is a transverse section through the structure illustrated in Fig. 5.

In carrying out my invention I propose.

to enclose the operating mechanism within a suitable casing, so that the mechanism is fully protected from the dirt which would otherwise render the device worthless in a short time. I prefer to use a long stroke pivoted lever to which both the crank and piston are connected.

Flat disc valves are referably employed for controlling the in ct and outlet assages of the pum cylinden. These va ves are sensitive, an L are capable of quickly openmg and closing a passage of relatively large area for the gas. Such valves may be cheaply constructed by stamping the disc from sheet metal, and the assembly of the valves with the cylinder is very simple, and lends itself peculiarly to the requirements of a pump of the character described.

\Vith this brief description of the purpose and advantages of the structure, I shall' refer, for a more detailed description, to the drawings, which, 5 indicates a shell closed by a cover 6, to form a casing. The cover is secured to the shell by bolts 7 so that the cover may be readily removed, when access to the working arts is desired. A gear casing 8 'is' seen to the shell on the side thereof opposite the cover 6. A shaft 9 is journaled in the gear casing 8 and shell 5 and is connected by a coupling 10 to the shaft 11 which may be driven from. any suitable source of power, such as an electric motor, (not shown).

The shaft 9 is provided with a pinion 12 meshing with a gear 13, fast to a jackshaft 14, which is journaled in the gear casing 8 and shell 5. A pinion 15 on the shaft 14 meshes with a gear 16 on a crank shaft 17, journaled in roller bearings 18, supported in the shell 5 and cover 6. A forked link 19 connects the crank shaft 17 to a lever 20, which is secured to a pivot shaft 21 mounted in a shell 5 and cover 6, adjacent one end of the shell. The lever 20 is adapted to oscillate under the actuation of the crank shaft and to-impart a long stroke to the piston 22, the stroke being materially longer than the diameter of the crank circle. Obviously a crank, to directly impart a corresponding" stroke, would require the interposition of a connecting rod and cross head to permit travel of the piston in the cylinder. The shell would have to be correspondingly enlarged to enclose the parts. The reduction in size of the shell, which is possible with my invention is a material advantage.

The piston 22 operates in a cylinder 23 secured to the shell 5 and is connected to the lever 20 b a piston rod 24. The connection between t e piston rod 24 and piston 22 is preferably a ball and socket joint, 8, sec-ks 25 being formed in the piston, to receive the ball 26, on the end of the piston rod.

Oscillation of the iston rod, as it moves back-and forth un er the actuation of the lever 20, is thus permitted, and binding of.

the piston in the cylinder is effectually prevented. v

To provide an inlet to the cyllnder a valve casing 27 is formed thereon. The valve cas-.

30 is threadedly or otherwise secured in the valve casing 27 and is provided with a lip 31 against WhlCll a disc valve 32 is normall held b a spring 33. Ingress of air throng the in et 34: and ports 29 is thus revented during the up strokes of the plston, the valve 32 being held against the lip 31 by the pressure of the air in the cylinder as well as the spring 33. The disc valve 32 is provlded with a plurality of cars 35, which engage the walls of the valve casing 27, and maintain the valve in proper operative relation to the lip 31.

The cylinder 23 is closed at its upper end by a cap 36, carrying the discharge pipe 37 and hose connection 37 A valve seat 38 is threadedly or otherwise secured in the cap 36 and is provided with an outlet port 39 and a lip 40 surrounding the ort. A disc valve 41 having cars 42, whic maintainit in operative position, is normally caused to engage the lip 40, by a sprin 43 arranged within the cap 36 above the va ve. The disc valve 41 closes the port 39 at the beginning of the downward stroke of the piston, so that return of the compressed air to the cylinder is prevented. The pressure of this air on the disc valve 41 assists the spring 43 in holding the disc valve closed.

In the operation of the pump, the rotation of the crank shaft 17 under the actuation of a suitable motor (not shown) causes the lever 20 to oscillate, thus reciprocating the piston 22. On the downward stroke of the piston air is drawn into the cylinder througn the'inlet ports 29. At the commencement of the u ward stroke the'inlet ports are closed and t e valve 41 is o ened to permit the air to pass into the discharge pipe 37. It will be noted that the inlet and outlet ports have a comparatively large cross sectlonal area. ensuring a full charge of air and com lete discharge thereof at every stroke. lifaximum e cienc of the pump is thus secured, even when t e latter is operated at comparatively high s eed.

In Figs. 5 an 6 of the drawing I have illustrated a form of my invention which is somewhat more compact than the form hereinbefore described and, therefore, es ecially desirable where a ve compact pumpis required. Re erring to the draworm of ing, indicates a shell in-which the operating mechanism of the 'pum is enclosed. The pump and parts thereo are identical with the structure hereinbefore described and corresponding reference numerals are accordingly applied to the respective elements thereof. Y

Supportedjin a suitable bearing 51 in the shell 50 is a shaft 52 carrying a gear 53. A crank pin 54 projecting from the gear 53 is connected by a link 55 with an arm 56 which is pivoted on a pin 57 projecting from a wal of the shell 50. The opposite end of the arm 56 is} connected to the piston rod 24 of the pump, so that as the gear 53 rotates the piston 22 of the pump is actuated; A shaft 57' is su ported in a suitable bearing 58 projecting, rom the shell 50 and a pinion 59 is mounted thereon to mesh with the gear 53. The shaft 57 is adapted to be connected in any suitable manner with a source of power as, for example, an electric motor (not shown) to drive the gear 53 and actuate the piston 22 of the pum It may be desirable, under certain con itions, to omit the shaft 57'. Thus, when the pump is mounted on a motor driven vehicle, the shaft 52 may be driven directly from a moving art of the driving gear of the vehicle and t e shaft 52 is, for this pu .ose, provided with a projecting end 60 whlch may be coupled with the driving mechanism of the vehicle. When the pump is to be thus used, the shaft 57 and pinion 59 may be withdrawn and the bearing 58, therefore, may be broken away, the opening for the shaft 57 being plugged in' any suitable manner. I

The mechanism as illustrated in Figs. 5 and 6 is obviously much more compact than that illustrated in connection with the preceding embodiment of my invention. The number of parts and cost of manufacture is materially reduced without destroying the effectiveness and utility of the pump. All of the essential characteristics 0 the pump as illustrated in Figs. 1 to 4 of the drawin are preserved in the simplified form thereo it being my purpose to provide in the embodiment of my invention illustrated in Figs. 5 and 6, a pum which may be manufactured and sold at re atively low cost to trade demanding thisclass of apparatus. 5

From the fore oing description it will be apparent that have devised a compact pump, of simple and inex ensive construction, which may be utilize and maintained in continuous operation, under conditions which would result in the rapid destruction of many pumps, now known or used Because ,of the simple construction and the pro-- tection afforded for the parts, the pump requires little attention and will continue to operate at maximum efliciency for long penods even if neglected. While my invention has been described particularly with reference to its utilization for compressing air to be used in neumatic tires, it is to be understood that t e pump may be used for other purposes, to which it is readily ada ted.

arious changes may be made in the form, arrangement and construction of the parts without departing from the invention or sacrificing an of its advantages, the form hereinbefore escribed being merely the preferred embodiment thereof.

I claim:

1. In a pump, the combination with the piston rod and the crank shaft, of connections between the piston rod and the crank shaft such that the stroke of the piston is materially lengthened without increase in the throw of the crank, and wherein lateral play of the piston rod is substantially eliminated, said connections comprising a lever pivoted at one end to a fixed'support and connected at the other end to the piston rod, and a link pivoted to the lever and operatively connected to the crank shaft whereby in normal operation the lever oscillates and the movement of the end of the lever connected with the piston rod is amplified in the direction of the axis of the piston.

2. In a pump the combination with the piston rod and the crank shaft, of a connection between the piston rod and the crank shaft such that the stroke of the piston is' materially len hened without increase in the throw of e crank, and wherein lateral play of the piston rod is substantially eliminated, the connection comprising a lever pivoted at one end to a fixed su port and connected at the other to the iston red, the crank bein pivoted to the ever intermediate the en s thereof whereby the movement of the end of the lever connected with the piston rod is amplified in the direction of t e axis of the piston, said lever being curved longitudinally and arranged with its convex edge upward.

In testimony whereof I affix my signature.

t GREGORY JOHN SPOHRER. 

